Foxfire Trail

Carry a fox lantern through three night woods, solve riddles of light and slip past slow, watchful shades.

Three.js4 build stagesComplete game available

Make it yours ↓Play full game ↗

Local build pack · No model call starts on this page

THE GAME LOOP

A small idea worth finishing.

A lantern that brightens while held: it reveals hidden charms and lights rune shrines, but burns oil fast and draws the shades from farther
Slow shades with readable sight cones (looping wisps, sweeping watchers, pacing prowlers); bushes, shrine light and tree trunks hide you
A light riddle in every wood (runes lit in a carved order, posts turned to carry a beam), shrine checkpoints, oil flasks and lantern upgrades

THE LOOK & FEEL

A world with its own personality.

A hooded keeper with a glowing fox-head lantern; ghostly shades with pale eyes and a cool rim light, soft-spooky and never gory or sudden
Instanced low-poly pines, oaks and birches over a painted forest floor, with trails edged by glowing mushrooms so the way stays readable
Warm islands of light (lantern, shrines, beams) against a night palette and fog for each wood: moss teal, fen blue and ember amber

MADE FOR THUMBS

Plan the phone experience first.

Virtual stick bottom-left; a big hold-to-brighten Lantern button and an Action button bottom-right, 48px+ in safe areas; the trail ahead stays clear.

The playbook requests H5 layouts and input. Real-device playtesting is still part of the build.

01 / MAKE IT YOURS

Same spark. Your world.

Change a few details. The brief and every build stage update together.

Your main characterYour worldWhat the player wants to achieveA personal touch Optional

02 / YOUR BUILD PLAYBOOKThree.js direction

Create a gentle night stealth-exploration game as one self-contained browser game in Three.js (WebGL2). The player is a young lantern keeper carrying a fox-shaped lantern walking through three misty night woods: a mossy hollow, a fen of boardwalks and an ember-lit pine grove. Goal: find three charms in each wood and open the stone gates before the lantern oil runs out. Soft-spooky only: no gore, no jumpscares, no strobing.

A high three-quarter camera that never turns, so north stays up. Holding the lantern brightens it: it reveals hidden charms and lights shrines but drains oil fast and lets shades see you from farther. Oil also drains slowly, flasks refill it and kindled shrines are safe checkpoints with a little oil to share. Slow shades follow readable patterns with visible sight cones; staying in view fills a notice meter, and a catch costs oil, nudges you away and grants a short grace. Bushes and shrine light hide you, trunks block sight. If the oil runs out you wake at the last shrine with one try fewer. Each wood has a riddle of light that gives its third charm.

Add a minimap, an objective line, a training glade, two difficulties, pause with settings, upgrades between woods and a dawn ending.

The full pack adds the H5 controls, build contract and acceptance checks.

Copying, downloading and customizing are free. No build starts here.

Read the full local build pack

# Foxfire Trail — SiGameGen original game brief

Prompt template, not a prebuilt game. Engine direction: Three.js.

## Project brief

Create a gentle night stealth-exploration game as one self-contained browser game in Three.js (WebGL2). The player is a young lantern keeper carrying a fox-shaped lantern walking through three misty night woods: a mossy hollow, a fen of boardwalks and an ember-lit pine grove. Goal: find three charms in each wood and open the stone gates before the lantern oil runs out. Soft-spooky only: no gore, no jumpscares, no strobing.

A high three-quarter camera that never turns, so north stays up. Holding the lantern brightens it: it reveals hidden charms and lights shrines but drains oil fast and lets shades see you from farther. Oil also drains slowly, flasks refill it and kindled shrines are safe checkpoints with a little oil to share. Slow shades follow readable patterns with visible sight cones; staying in view fills a notice meter, and a catch costs oil, nudges you away and grants a short grace. Bushes and shrine light hide you, trunks block sight. If the oil runs out you wake at the last shrine with one try fewer. Each wood has a riddle of light that gives its third charm.

Add a minimap, an objective line, a training glade, two difficulties, pause with settings, upgrades between woods and a dawn ending.

## Local build contract

Work in a new isolated project directory through my signed-in local Claude Code subscription. Do not call a separate model/image API, change provider settings, use an API gateway or spend on a paid service. Do not deploy, publish, commit or push without an explicit follow-up instruction. Read applicable repository instructions first.
Build a complete browser game with the full campaign and progression in the project brief. Keep the rules-first stage as development work, then finish the art, game feel and release review before calling the game complete. Include an interactive skippable tutorial, distinct data-driven levels or missions, meaningful progression, fair failure and chapter retry, a final ending, settings and replay. Pin locally installed dependencies; bundle code, engine, fonts and assets into a self-contained HTML. Use original procedural art or supplied assets with permission and keep a licence inventory. Separate deterministic rules, input, renderer, UI, audio and scene data.
SiGameGen embed contract: opaque-origin iframe, no runtime CDN/imports, fetch/XHR/WebSocket, browser storage, popups or page navigation. Keyboard and touch must work without pointer lock on phones. Emit only integer points: parent.postMessage({type:'sigamegen:game-event',version:1,event:'started',score:0}, '*') once per run, and the same schema with event:'game_over' and the final score once at win/loss. Points are not money.
Save campaign checkpoints through the host only. Request {type:'sigamegen:save-request',version:1,gameId:'<game-id>'}; accept {type:'sigamegen:save-state',version:1,gameId,state,storage:'available'|'unavailable'} only from window.parent. Validate your actual save schema, own-key IDs and ranges. Post {type:'sigamegen:save',version:1,gameId,state} with a small plain JSON state (<=8192 UTF-8 bytes); state:null explicitly clears it. Show saved only after {type:'sigamegen:save-status',version:1,gameId,status:'saved'|'cleared'|'unavailable'|'invalid'} from the parent. Failed or missing acknowledgements must stay honest and allow retry; missing storage must not block play. Local progress and scores never authorize money or rewards.
Audio is off until opt-in. Support volume, reduced motion, safe areas, controls at least 48px, portrait/landscape camera fit, pointercancel, pause/restart confirmation, tab hide and return without fast-forward. Tutorial hints must leave the action visible, and primary actions must fit short landscape screens. Stop rendering while paused, hidden and on results; cap particles/enemies and mobile DPR at 1.5. Target <=1.6MB raw / 400KB gzip; measure the actual result, not a promise. Test actual game fairness, legal-input progression, loss/retry and save validation; then review the full campaign, upgrades, ending and replay in the real sandbox at 320x568, 393x852, 852x393 and desktop. Keep inspection bots and debug controls out of release builds. Report passed checks and untested device/audio paths separately.

## Continue in the same Claude Code project

### 1. Core mechanics

Build deterministic fixed-step rules first with greybox trees, bushes and shrines for a young lantern keeper carrying a fox-shaped lantern in three misty night woods: a mossy hollow, a fen of boardwalks and an ember-lit pine grove: seeded tree scatter that keeps trails clear, circle collision, water and boardwalks, lantern brightness and oil, hidden-charm reveal, shades on loops, sweeps and beats with cones and line of sight, notice, catch and grace, shrine checkpoints and refills, the riddles, gates and tries, so a player can find three charms in each wood and open the stone gates before the lantern oil runs out. Test that everything is reachable, hidden charms need bright light, bushes and shrine light keep you safe, and an input-only bot wins every difficulty while careless and idle play lose.

### 2. Art pass

Art pass for three misty night woods: a mossy hollow, a fen of boardwalks and an ember-lit pine grove: model a young lantern keeper carrying a fox-shaped lantern with a cloak, hood and a glowing fox-head lantern, and three shade types with pale eyes and a cool rim light. Paint each wood floor on a canvas from the same trail data the rules use, instance the trees, edge the trails with glowing mushrooms, and build the landmarks (a hollow oak, a heron tower and lantern posts, a stone ring and a fox statue), shrines, rune stones and stone gates. Keep a licence note.

### 3. Game feel

Make the walk to find three charms in each wood and open the stone gates before the lantern oil runs out readable and calm: a pool of lantern light on the ground that shows your reach, sight cones that warm from blue to red as a shade notices you, a soft vignette while seen, sparkles where a hidden charm waits, a beam that runs post to post, gate sockets that fill with charms, opt-in quiet music that grows tense under a gaze, and a training glade whose lessons need a real kindle, reveal, hide and refill.

### 4. Review & ship

Review a young lantern keeper carrying a fox-shaped lantern in three misty night woods: a mossy hollow, a fen of boardwalks and an ember-lit pine grove as a release candidate at 320x568, 393x852, 852x393, 852x345 and desktop: controls 48px+ in safe areas; the keeper, the thing you walk to, the trail ahead and nearby shades clear of the HUD and the thumb controls; trees between the camera and the keeper dithered away. Clear inputs on blur, pause and hide. Validate saves with own-key ids and journey checks, and ship one offline HTML without dev tools and with one started and one game_over per run.

## Acceptance checks

- Every charm, flask, shrine, rune stone, post and gate is reachable on foot, and the trails stay clear of trees.
- A hidden charm cannot be taken until a bright lantern reveals it; low light never reveals it, however long you stand there.
- A bush with the lantern low, a kindled shrine and a trunk in the line of sight each keep a watching shade from catching you.
- An input-only bot finishes both difficulties; careless play loses on a Wild night and idling loses when the oil and tries run out.

## Research references

These are design references, not included code or assets. The prompts are original SiGameGen briefs. Model attribution in external repositories is creator-reported.

- Nightfall · miguelsolorio: https://github.com/miguelsolorio/nightfall
  Creator documents procedural woodland geometry, synthesized atmosphere and separate keyboard/touch controls. Our original complete Three.js adventure has three night woods, nine charms, distinct light riddles, watchful shades, shrine checkpoints and lantern upgrades. Its cover uses the normal gameplay camera; sound is opt-in.

Want a quick 2D sketch first?

The online builder adapts these mechanics to Canvas 2D. The full Three.js version is built in your local Claude Code project.

Open a 2D sketch ↗Opening the builder is free. Only confirming Build game uses platform credits.

DONE MEANS PLAYABLE

The checks this game should pass.

Every charm, flask, shrine, rune stone, post and gate is reachable on foot, and the trails stay clear of trees.
A hidden charm cannot be taken until a bright lantern reveals it; low light never reveals it, however long you stand there.
A bush with the lantern low, a kindled shrine and a trunk in the line of sight each keep a watching shade from catching you.
An input-only bot finishes both difficulties; careless play loses on a Wild night and idling loses when the oil and tries run out.

These are requirements for your future build, not results already verified for this prompt.

RESEARCH, WITH CREDIT

What shaped this playbook.

Original SiGameGen prompts authored in our local Claude Code subscription session. References inform the design; their code, assets and prompts are not bundled. External model attribution is creator-reported.

GitHub

Nightfall · miguelsolorio ↗

Creator documents procedural woodland geometry, synthesized atmosphere and separate keyboard/touch controls. Our original complete Three.js adventure has three night woods, nine charms, distinct light riddles, watchful shades, shrine checkpoints and lantern upgrades. Its cover uses the normal gameplay camera; sound is opt-in.